The compound (B) formed in the following sequence of reactions
CH3CH2CH2OHPCl5−−−→(A)alc.KOH−−−−−→(B)
Propene
propyne
propane
Propanal
CH3CH2CH2OHPCl5−−−→CH3CH2CH2Clalc.KOH−−−−−→CH3−CH=CH2